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A208598 Number of 4-bead necklaces labelled with numbers -n..n not allowing reversal, with sum zero 2
6, 23, 60, 125, 226, 371, 568, 825, 1150, 1551, 2036, 2613, 3290, 4075, 4976, 6001, 7158, 8455, 9900, 11501, 13266, 15203, 17320, 19625, 22126, 24831, 27748, 30885, 34250, 37851, 41696, 45793, 50150, 54775, 59676, 64861, 70338, 76115, 82200, 88601 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A208597

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = (4/3)*n^3 + 2*n^2 + (5/3)*n + 1

EXAMPLE

Some solutions for n=4

.-3...-4...-3...-3...-4...-2...-2...-3...-4...-2...-3...-1...-4...-3...-4...-4

..1...-2....4....3....0....0....0...-1....1...-2....4...-1....2...-1....1...-1

..4....2....0...-3....3...-2....0....3....1....4...-1....2...-2....4....0....3

.-2....4...-1....3....1....4....2....1....2....0....0....0....4....0....3....2

CROSSREFS

Sequence in context: A273214 A273276 A273252 * A119712 A273314 A281424

Adjacent sequences:  A208595 A208596 A208597 * A208599 A208600 A208601

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 29 2012

STATUS

approved

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Last modified December 10 20:48 EST 2017. Contains 295856 sequences.